ScrollView 滚动视图

ScrollView 种类:

1.HorizontalScrollView:水平滚动视图

2.ScrollView：垂直滚动视图(常用类)

public class MainActivity extends AppCompatActivity {
    private TextView text;
    private ScrollView scrollView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //注册控件
        text = (TextView) findViewById(R.id.txt);
        scrollView = (ScrollView) findViewById(R.id.scrollview);

        //设置text文本内容
        text.setText(getResources().getString(R.string.context));

        //设置ScrollView滚动条不可见
        scrollView.setVerticalScrollBarEnabled(false);

        scrollView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()){
                    case MotionEvent.ACTION_UP:{
                        break;
                    }

                    case MotionEvent.ACTION_DOWN:{
                        break;
                    }

                    case MotionEvent.ACTION_MOVE:{
                        //顶部状态
                        if(scrollView.getScrollY() <= 0){
                            Log.i( "main", "到达顶部");
                        }
                        //底部状态
                        //TextView的总高度 <= 一屏幕的高度 + 滚动条的滚动距离
                        if(scrollView.getChildAt(0).getMeasuredHeight() <= scrollView.getHeight() +
                                scrollView.getScrollY()){
                            Log.i("main","到达底部" + "总高度" + scrollView.getChildAt(0).getMeasuredHeight() + "一屏幕高度" + scrollView.getHeight() + "滚动条滚动距离" + scrollView.getScrollY());
                            //添加内容
                            text.append(getResources().getString(R.string.context));
                        }
                        break;
                    }
                }
                return false;
            }
        });

    }

　　

按钮滚动

scrollTO(x,y) 跳转到固定坐标

scrollBy(x,y)相对当前位置移动x,y

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        //注册控件
        text = (TextView) findViewById(R.id.txt);
        scrollView = (ScrollView) findViewById(R.id.scrollview);
        up_btn = (Button) findViewById(R.id.up);
        down_btn = (Button)findViewById(R.id.down);

        //按钮点击监控事件
        up_btn.setOnClickListener(this);
        down_btn.setOnClickListener(this);

        //设置text文本内容
        text.setText(getResources().getString(R.string.context));

        //设置ScrollView滚动条不可见
        scrollView.setVerticalScrollBarEnabled(false);

        scrollView.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                switch (event.getAction()){
                    case MotionEvent.ACTION_UP:{
                        break;
                    }

                    case MotionEvent.ACTION_DOWN:{
                        break;
                    }

                    case MotionEvent.ACTION_MOVE:{
                        //顶部状态
                        if(scrollView.getScrollY() <= 0){
                            Log.i( "main", "到达顶部");
                        }
                        //底部状态
                        //TextView的总高度 <= 一屏幕的高度 + 滚动条的滚动距离
                        if(scrollView.getChildAt(0).getMeasuredHeight() <= scrollView.getHeight() +
                                scrollView.getScrollY()){
                            Log.i("main","到达底部" + "总高度" + scrollView.getChildAt(0).getMeasuredHeight() + "一屏幕高度" + scrollView.getHeight() + "滚动条滚动距离" + scrollView.getScrollY());
                            //添加内容
                            text.append(getResources().getString(R.string.context));
                        }
                        break;
                    }
                }
                return false;
            }
        });

    }
    
    @Override
    public void onClick(View v) {
        switch (v.getId()){
            case R.id.up:{
                scrollView.scrollBy(0,-30);
                break;
            }

            case R.id.down:{
                scrollView.scrollBy(0,+30);
                break;
            }
        }
    }